You can try with jute and flax, recently many work is going with these material for bullet-proof vest

Aramide and UHMWPE are typical materials, but we have also made some experiments with wool which is felted afterwards, leading to shrinkage and thus denser materials.

Thanks Mr Arun, for the enlightenment info on jute and flax fibres. I should then try to evaluate their natural type vs the thermoplastic type (in which fundamental data could be established first).. Appreciate it so much (y)

To Mrs Andrea, the candidates of materials that you'd suggested, would definitely open more dimension towards my new research area.. I'll give a consideration on these materials.. Thank you! :-)

i like to add few thing. If we are going for some cost effective natural way, i sometimes lead to shrinkage than syntetic one. The materials i relay on aramid fibres or carbon fibres. base material preferably kevelar, carbon fibre or as said UHMWPE(I PREFER THIS LAST)

Thanks Aswin for your brilliant info.. Agree with you that synthetic materials would be more cost effective than the natural (in term of shrinkage etc). BTW, the candidates that you're suggesting would almost similar to what Mrs Andrea had recommended earlier, and surely they will go into my considerations (for characterization and evaluation purpose).. Thanks a million.

PM, there is a research group from our country made a bullet proof vest from natural rubber alumina composite and natural silk with incredible energy absorption under ballistic impact.

Salam Hawa, that's great and thank you for your info. In syaa Allah will find out about it.. FYI, I had been asked personally by our PDRM team to look into this research.. :-)

Or, we can do the other way around, active "personal sonar" to detect movement of object in 50 m radius. :)

Thank you Dr Nadhim and Mr Renan for your kind answers... I do appreciate it very much..